juneau-core/juneau-core-utest/src/test/java/org/apache/juneau/utils/PojoMergeTest.java

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package org.apache.juneau.utils;

import static org.junit.Assert.*;

import org.junit.*;

/**
 * Test the PojoMerge class.
 */
public class PojoMergeTest {

	//====================================================================================================
	// Basic tests
	//====================================================================================================
	@Test
	public void basicTests() throws Exception {
		IA a1, a2, am;

		a1 = new A("1"); a2 = new A("2");
		am = PojoMerge.merge(IA.class, a1, a2);
		assertEquals("1", am.getA());
		am.setA("x");
		assertEquals("x", am.getA());
		assertEquals("x", a1.getA());
		assertEquals("2", a2.getA());

		a1 = new A("1"); a2 = new A("2");
		am = PojoMerge.merge(IA.class, true, a1, a2);
		assertEquals("1", am.getA());
		am.setA("x");
		assertEquals("x", am.getA());
		assertEquals("x", a1.getA());
		assertEquals("x", a2.getA());

		a1 = new A(null); a2 = new A("2");
		am = PojoMerge.merge(IA.class, a1, a2);
		assertEquals("2", am.getA());
		am.setA("x");
		assertEquals("x", am.getA());
		assertEquals("x", a1.getA());
		assertEquals("2", a2.getA());

		a1 = new A(null); a2 = new A(null);
		am = PojoMerge.merge(IA.class, a1, a2);
		assertEquals(null, am.getA());

		a1 = new A(null); a2 = new A("2");
		am = PojoMerge.merge(IA.class, null, a1, null, null, a2, null);
		assertEquals("2", am.getA());
	}

	public static interface IA {
		String getA();
		void setA(String a);
	}

	public static class A implements IA {
		private String a;

		public A(String a) {
			this.a = a;
		}

		@Override
		public String getA() {
			return a;
		}

		@Override
		public void setA(String a) {
			this.a = a;
		}
	}
}